How to Connect Pc to 4k Tv for Gaming: Step-by-Step Guide (2026)

Connecting your gaming PC to a 4K TV lets you play at 3840×2160 resolution on a large screen with HDR, variable refresh rate, and surround sound, all from your couch. When set up correctly, your TV will act as a primary or secondary monitor at 4K 60Hz or 4K 120Hz with low input lag and full chroma. This guide walks you through the exact cables, TV settings, and Windows adjustments to get there without guesswork.

Prerequisites: A PC with an HDMI 2.0 or HDMI 2.1 output (or DisplayPort 1.4 with an active adapter), a 4K TV with at least one HDMI 2.0/2.1 port, and Windows 10 or Windows 11 installed. You should also know your GPU model and have your TV remote handy.

Before You Start

Step-by-Step

Step 1: Check Your Ports and Choose the Right HDMI Input – Time: 2 minutes

Look at the back or side of your TV for HDMI labels. On most 2026 models from LG, Samsung, Sony, and TCL, only one or two ports support HDMI 2.1 full bandwidth, often labeled HDMI 3 (eARC) or HDMI 4 4K 120Hz. Note the label. On your PC, identify the HDMI port directly on the graphics card, not the motherboard I/O. If your GPU only has DisplayPort, connect your active DisplayPort to HDMI 2.1 adapter to that port now. Power off both devices before plugging in to avoid handshake errors.

Step 2: Connect the Cable and Enable Enhanced HDMI on the TV – Time: 3 minutes

Plug the Ultra High Speed HDMI cable from the GPU to the HDMI 2.1 port you identified. Power on the TV first, then the PC. Using the TV remote, enable the full-bandwidth mode required for 4K 120Hz and HDR. The setting name varies by brand:

Samsung: Home > Menu > Settings > All Settings > Connection > External Device Manager > Input Signal Plus > Enable for the connected HDMI port

LG: Home > Settings > General > External Devices > HDMI Settings > HDMI Deep Color > On

Sony: Home > Settings > Channels & Inputs > External inputs > HDMI signal format > Enhanced format (or Enhanced format VRR)

TCL / Hisense: Settings > System > HDMI & CEC > HDMI Mode > Enhanced or HDMI 2.1

If you skip this, Windows will be limited to 4K 60Hz or will show no HDR option.

Step 3: Enable Game Mode and Low Latency Settings on the TV – Time: 2 minutes

Switch to the correct HDMI input with the Source or Input button. Open the TV picture settings and enable Game Mode. This disables extra processing and reduces input lag to under 15ms on most sets.

LG: Settings > Picture > Advanced Settings > Game Mode > On and set Instant Game Response to On

Samsung: Settings > All Settings > Connection > Game Mode > On

Sony: Settings > Display & Sound > Picture > Picture Mode > Game

Also disable motion smoothing if it remains active: set Auto Motion Plus, MotionFlow, or Action Smoothing to Off. Keep ALLM and VRR set to Auto if available.

Step 4: Set Resolution, Refresh Rate, and Scaling in Windows – Time: 4 minutes

On your PC, right-click the desktop and select Display settings. Or use the path Settings > System > Display.

Under Scale & layout, set Scale to 150% to 200% for readable text on a 4K TV from couch distance. Under Display resolution, select 3840 x 2160 (Recommended). If you see duplicate displays, click Identify, then select the TV (usually labeled as 2 or your TV model name).

Next, click Advanced display or Advanced display settings. Select your TV from the Choose a display dropdown. Under Choose a refresh rate, select 120 Hz if your cable and port support it, otherwise select 60 Hz. Click Apply and Keep changes.

To create a custom refresh rate if 120 Hz does not appear: Open NVIDIA Control Panel > Display > Change resolution > Customize > Create Custom Resolution, or AMD Software: Adrenalin Edition > Display > Custom Resolutions > Create New. Set 3840×2160 at 120Hz and test.

Step 5: Configure GPU Control Panel for Full Color and VRR – Time: 3 minutes

For NVIDIA GPUs: Right-click desktop > Show more options > NVIDIA Control Panel. Go to Display > Change resolution. Select your TV, set Resolution to 3840×2160, Refresh rate to 120Hz, and under Apply the following settings choose Use NVIDIA color settings. Set Desktop color depth to Highest (32-bit), Output color format to RGB, Output dynamic range to Full, and Output color depth to 10 bpc if available. Then go to Display > Set up G-SYNC > check Enable G-SYNC, G-SYNC Compatible > Enable for full screen mode > check Enable settings for the selected display model.

For AMD GPUs: Right-click desktop > AMD Software: Adrenalin Edition. Go to Display > Display Specs > Overrides. Set Color Depth to 10 bpc, Pixel Format to RGB 4:4:4 Full RGB, and toggle FreeSync or Adaptive Sync Compatible to Enabled. Set Refresh Rate to 120Hz.

If the TV screen flickers or goes black, the color settings exceed your cable bandwidth. Reduce to YCbCr 4:2:0 or 8 bpc and retest.

Step 6: Enable HDR and Calibrate in Windows – Time: 3 minutes

Go to Settings > System > Display > HDR. Select the TV display at the top. Toggle Use HDR to On. Then click HDR calibration or go to Settings > System > Display > HDR > Display calibration for HDR video to run the Windows HDR Calibration app. If you do not have the app, install it from the Microsoft Store and launch it from Start > Windows HDR Calibration.

Follow the on-screen steps to set black level, white level, and color saturation. After calibration, return to Settings > System > Display > HDR and enable Auto HDR if you want SDR games to be enhanced. In-game, enable HDR in the game graphics menu: typically Options > Graphics > Display > HDR > On and set Peak Brightness to match your TV, usually 700 to 1000 nits for mid-range models or 1000 to 1500 nits for OLED.

Step 7: Set Audio Output and Display Mode – Time: 2 minutes

To send audio to the TV speakers or soundbar, go to Settings > System > Sound. Under Output, select your TV model (for example, LG TV or HDMI) as the Output device. Click the arrow next to it and set Format to 24-bit, 48000 Hz or Dolby Atmos for home theater if your system supports eARC. Test with the Test button.

To control how the TV behaves as a monitor, press Windows key + P and choose an option: Duplicate duplicates your monitor, Extend treats the TV as a second screen, and Second screen only disables the desktop monitor and shows only on the TV, which is best for couch gaming to avoid performance overhead. For exclusive 4K gaming, select Second screen only.

Verify It Worked

Open Settings > System > Display > Advanced display. Confirm next to your TV it shows 3840 x 2160, 120Hz (or 60Hz), Bit depth 10-bit, and HDR Certified or HDR Supported as Yes.

Press Windows key + Alt + B to toggle HDR quickly. The screen should dim or brighten slightly and HDR should show as On in the HDR settings.

On the TV, press the Info or 123 button or go to Menu > Support > Self Diagnosis > Signal Information to confirm the input signal reads 3840×2160/120p, RGB or YCbCr 4:4:4, and HDR10 or Dolby Vision.

Launch a game and enable V-Sync off with the in-game frame rate limiter set to 117 FPS for 120Hz panels to test VRR. If you use keyboard controls, press Alt + Tab smoothly with no tearing or black flashes. Right-click desktop > NVIDIA Control Panel > Display > View G-SYNC Visual Indicator or check AMD Metrics Overlay with Ctrl + Shift + O to verify VRR is active.

Check input lag by moving the mouse rapidly. Motion should feel immediate with no trailing or delayed response when Game Mode is active.

Mistakes to Avoid

1. Black Screen or No Signal at 4K 120Hz

What causes it: The TV HDMI port is not in Enhanced mode, the cable is 18Gbps instead of 48Gbps, or the GPU color settings exceed bandwidth.

How to check: Go to Settings > System > Display > Advanced display. If 3840×2160 at 120Hz is missing, or the TV shows No Signal when you select 120Hz, the handshake failed. Try a different HDMI port on the TV.

What to do: On the TV, verify Input Signal Plus or HDMI Deep Color is On for that port. Replace the cable with a certified Ultra High Speed HDMI cable. In NVIDIA Control Panel > Change resolution, set Output color format to YCbCr 4:2:0 and Output color depth to 8 bpc temporarily, then retest at 120Hz.

How to undo: Restore Output color format to RGB and Output color depth to 10 bpc after confirming the cable and port work, or reconnect your previous monitor via DisplayPort.

2. Washed-Out Colors or Gray Blacks with HDR

What causes it: Limited vs Full RGB mismatch between the TV and GPU, or HDR left enabled on the desktop with SDR content.

How to check: Open a black image full screen. If black looks gray, go to Settings > System > Display > HDR. Toggle Use HDR off and compare. Also check NVIDIA Control Panel > Change resolution > Output dynamic range.

What to do: Set Output dynamic range to Full on the PC and on the TV set HDMI Black Level or RGB Range to Auto or High/Full. In Windows, keep Use HDR Off for desktop use and enable it only for HDR games, or use Windows key + Alt + B to toggle. Recalibrate with the Windows HDR Calibration app.

How to undo: Set Output dynamic range back to Limited and TV Black Level to Low/Limited if you revert to a limited-range monitor, or turn HDR back off in Settings > System > Display > HDR.

3. Laggy Controls Even in Game Mode

What causes it: Game Mode is off, motion smoothing is still on, or the TV is applying additional processing like Noise Reduction or Dynamic Contrast.

How to check: Press the TV Info button while gaming. If the picture mode shows Standard, Vivid, or Filmmaker instead of Game, processing is active. Move the mouse and count the delay between movement and screen response.

What to do: Enable Game Mode as described in Step 3. Then go to Picture > Advanced Settings or Expert Settings and set Sharpness to 10-20, Noise Reduction to Off, MPEG Noise Reduction to Off, and Dynamic Contrast to Off. On Samsung, also set Game Mode > Game Motion Plus to Off.

How to undo: Switch Picture Mode back to Standard or Filmmaker Mode for movies, which re-enables processing. Game Mode can be left on Auto so it engages only when a game is detected.

4. No Sound Through the TV or Soundbar

What causes it: Windows audio output is still set to the desktop speakers or headphones, or the TV audio input is set to Optical instead of HDMI.

How to check: Go to Settings > System > Sound > Output. Play a test sound. If the volume bar moves but no audio is heard, the wrong device is selected. Check the TV: Settings > Sound > Sound Output.

What to do: In Settings > System > Sound, select the TV or HDMI device as Output. Set TV Sound Output to HDMI Receiver or Pass-Through if using a soundbar connected via eARC. If using a receiver, enable HDMI-CEC: Settings > System > HDMI & CEC > CEC > On and eARC > Auto.

How to undo: Reselect Speakers (Realtek) or your Headphones as Output in Settings > System > Sound, and set TV Sound Output back to TV Speaker for normal viewing.

FAQ

Do I need HDMI 2.1 for 4K gaming on a TV?

You need HDMI 2.1 only if you want 4K at 120Hz with HDR and VRR at full color. HDMI 2.0 supports 4K at 60Hz with HDR and is sufficient for many games, especially story-driven titles capped at 60 FPS. If your GPU has DisplayPort 1.4 but no HDMI 2.1, an active DisplayPort to HDMI 2.1 adapter that supports 48Gbps provides the same capability.

How do I fix overscan where the taskbar is cut off?

Modern TVs should not overscan when set to PC or Game Mode. First, on the TV, go to Settings > Picture > Picture Size > Just Scan or Screen Fit and enable it. On Samsung, go to Settings > All Settings > Picture > Picture Size Settings > Fit to screen > On. Then in Windows, verify Display resolution is 3840×2160 and Scale is 150% to 200%. Avoid using Adjust desktop size and position in NVIDIA Control Panel unless Just Scan does not resolve it.

Why does HDR look darker on my TV when gaming?

HDR often looks dim if the TV Energy Saving mode or peak brightness limiter is active. On the TV, go to Settings > General > Power and Energy Saving > Energy Saving Step > Off, and set Picture > Advanced Settings > Peak Brightness to High. In Windows, go to Settings > System > Display > HDR and drag the SDR content brightness slider to 40 to 60. In the game HDR settings, raise Paper White or UI Brightness to 150 to 250 nits and set Peak Brightness to your TV actual rating.

Can I use the TV as a second monitor and the desktop monitor at the same time?

Yes. Press Windows key + P and select Extend. Go to Settings > System > Display, drag the display arrangement to match physical placement, and select Make this my main display for whichever screen you want the taskbar on. Set each display refresh rate independently in Advanced display: for example 3840×2160 at 120Hz for the TV and 2560×1440 at 144Hz for the desk monitor. Keep both on GPU color settings RGB Full to avoid color mismatch when dragging windows between screens.